HPB has a great reputation over on E90Post for having rock-solid HID kits that won't throw errors, and they have an almost perfect track record on the pick 06/07 models too. Everything I've bought from them (interior kit for my car + friend's cars, AE's, turn signals, etc.) has exceeded my expectations, and their customer service is incredibly helpful for an extremely small business.

Interesting, i have not ordered yet, thanks for this! My 3 concerns are
-will it throw a code?
-how hot will the get, they are made for turn signlas, ut being DRL's they would be on for a while
-how easy to install? i got into the area i need to install and its tight as hell in there

also. what would the return policy be? i will be calling this new place tomorrow, thanks again!